[thenaturalist]

If you do not differentiate between sugar and calories you clearly can learn a lot about the human digestion and microbiomes.

Complex (slow) carbs [does it feed your microbiome predominantly] != easy (fast) carbs [does it quickly go into your bloodstream and cells]

[jeffbee]

Calorie for calorie beetroot juice has the same sugar content as beets. I am certain you are not asserting that beets are not something that humans would normally digest.

[thenaturalist]

Well the difference between the veggie and the juice is that the former contains a whole lot more of fiber which is an especially beneficial nutrient for our gut microbiome.

Reading up on juices, I've only heard of experts not being fans of 'em.